Apple recently doubled the cost quietly for RAM upgrades for the entry-level MacBook Pro. In the past, Apple would charge customers $100 to upgrade from 8GB to 16GB, now the upgrade costs an extra $100. The increase has also applied around the world.
The price increase is generally due to supply and demand, especially now with more people working from home. The increase could be due to disruptions caused by COVID-19 or other issues.
The MacBook Pro 13-inch was recently refreshed bringing the new scissor switch-based Magic Keyboard. This was one of the only major changes to the entry-level 13-inch MacBook Pro with the hardware remaining unchanged, still shipping with eighth-gen Intel processors.
Pricing for RAM has not changed for the rest of Apple’s lineup, this is due to other Mac models using different RAM types and suppliers.